摘要
采用激光选区熔化成形工艺制备CoCrWMo合金,将合金在1200℃固溶1 h后再分别在600,700,750,800和900℃下时效10 h,研究固溶−时效处理对合金组织与性能的影响。结果表明,SLM成形态CoCrWMo合金由FCC的γ相和HCP的ε相马氏体组成。在固溶时效过程中,发生γ相(FCC相)向ε相(HCP相)的转变,随时效温度升高,ε相马氏体含量增加,同时析出沉淀物M23C6(M=Cr,Mo,W)。在750℃时效的合金中,ε相比例为77%,表明时效处理可促进FCC→HCP马氏体的相变,所有时效态合金的显微硬度均明显高于固溶态合金的硬度。在750℃时效的合金,在兼顾伸长率的同时,强度提高,抗拉强度和屈服强度分别为1076 MPa和820.8 MPa,伸长率达10.5%。
The selective laser melted(SLM)CoCrWMo alloys were solution treated at 1200℃for 1 h,and then aged at 600,700,750,800 and 900℃for 10 h respectively.The effects of solution-aging treatment on the microstructure and properties of the alloy were studied.The results show that the SLM CoCrWMo alloy is composed of FCCγphase and HCPεphase martensite.The transformation fromγphase(FCC phase)toεphase(HCP phase)occurs during solutionaging treatment.The content ofεphase martensite increases with increasing the aging temperature,M23C6(M=Cr,Mo,W)precipitated at the same time.In the alloy aged at 750℃,the proportion ofεphase is 77%,indicating that aging treatment can promote the transformation of FCC→HCP martensite.The microhardness of all aged alloys is significantly higher than that of solid solution alloys.The strength of the alloy aged at 750℃is improved while the elongation is taken into account,the tensile strength and yield strength are 1076 MPa and 820.8 MPa respectively,and the elongation reaches 10.5%.
作者
班乐
黄嘉豪
毛卫东
吴苑标
肖志瑜
BAN Le;HUANG Jiahao;MAO Weidong;WU Yuanbiao;XIAO Zhiyu(National Engineering Research of Net-Sharp Forming for Metallic Material,South China University of Technology,Guangzhou 510640,China;Guangzhou Zoltrix HIP Material Co.Ltd,Guangzhou 511458,China;Foshan Nanhai Zhongnan Machinery Co.Ltd,Foshan 528247,China)
出处
《粉末冶金材料科学与工程》
EI
北大核心
2020年第1期27-34,共8页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金重大仪器项目(51627805)
广东省自然科学基金团队项目(2015A030312003)
广东省科技项目(2014B010129003,2017B090901025)
关键词
CoCrWMo合金
固溶时效
激光选区熔化
显微组织
力学性能
CoCrWMo alloys
solution-aging treatment
selective laser melting
microstructure
mechanical properties
